Source: FAO 2002.
| Family | Scientific Name | Author | Year | Common Name |
| Synaphobranchidae | Synaphobranchus kaupi | Johnson | 1862 | Northern Cutthroat Eel |
All Synaphobranchus Species: Head more elongate, mouth extends to level of posterior edge of eye or beyond. Gill openings on the 2 sides united as a longitudinal slit on ventral midline. Scales present.
Synaphobranchus kaupi
Unique Characters: Scales very elongate (3-4 times as long as wide), small, regularly arranged in aligned clusters of 4 or 5 set at right angles to other such groups. Dorsal-fin origin well behind level of anus. Vomerine teeth uniserial but zig-zag anteriorly.
Similar Species:
Synaphobranchus brevidorsalis, Shortfin Cutthroat Eel
Shortfin Cutthroat Eel, Synaphobranchus brevidorsalis. Scales present, rounded.
Synaphobranchus affinis, Grey Cutthroat Eel
Grey Cutthroat Eel, Synaphobranchus affinis. Scales oval, not so regularly arranged. Dorsal-fin origin at or just posterior to level of anus. Vomerine teeth uniserial.
